Re: Collector current design point for Q911+Q912? #ubitx #v6

barry halterman
 

Evan, I know that the value is shown as 470pf, but have you measured it in on the board, in the circuit, by any chance?
Like I said earlier, I measured it at 12nf. Someone posted that he changed the value to .01uf (10nf) and his power went up... I too have the low power syndrome with my V6. My v4 kicks butt at over 18 watts on 80 and 11 watts on 40. My V6 on 80 is 6 watts and 4 watts on 40. I don't recall the power on the higher bands.
Trying to figure out what is different in the power chain to cause such a big difference between versions.
Thanks for responding.
Barry
K3Bo

On Wed, Feb 12, 2020, 2:56 PM barry halterman via Groups.Io <kthreebo=gmail.com@groups.io> wrote:
Can someone check the capacitance of c81 in circuit and see what value you get. I get 12.nf when I go across that particular cap. Far from 470pf but then again there is other circuitry to mess with the LC meter.
Barry

On Wed, Feb 12, 2020, 11:57 AM Rick Price <rickprice48@...> wrote:
v3 Schematic shows C81 as a 0.1u
 
Rick Price
KN4AIE


From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Evan Hand
Sent: Wednesday, February 12, 2020 11:52 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Collector current design point for Q911+Q912? #ubitx #v6

FYI

C81 is 470pF in both the v4 and v5 boards that I have.

73
Evan
AC9TU

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